A superimposed disc type charge-stabilized multi-stream jet atomization device

Abstract

The application discloses a superposed disc type charged stable multi-strand jet flow atomization device, which comprises a liquid injection unit, a multi-strand jet flow atomization unit and a gas-assisted conveying unit, the liquid injection unit is connected with the stable multi-strand jet flow atomization unit, the stable multi-strand jet flow atomization unit comprises a plurality of superposed discs, an adjusting cylinder and a ground electrode cylinder are sequentially arranged from inside to outside along the radial direction of the disc, the disc and the adjusting cylinder are respectively connected with the negative electrode of a negative high-voltage power supply, a first-stage potential difference is formed, and the ground electrode cylinder is grounded, and a second-stage potential difference is formed between the ground electrode cylinder and the adjusting cylinder; the gas-assisted conveying unit comprises an annular flow channel, a guide vane and a micro fan, and the micro fan is arranged at the axis of the top end of the ground electrode cylinder. The superposed disc with a novel electric field enhancement structure and the space shielding electrode are adopted, and the jet flow stability and the atomization flow of the electrostatic atomization device are greatly improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electrostatic atomization, and particularly relates to a superimposed disc type charged stable multi-jet flow atomization device. BACKGROUND

[0002] Electrospray (ES) technology is an atomization technology that can produce a large number of charged droplets with extremely low energy consumption. The main principle of this technology is to weaken the surface tension of the liquid flowing out of the nozzle through the electrostatic effect of the applied electric field and make it break. Compared with traditional mechanical atomization methods, the liquid droplets produced by electrospray have the advantages of small particle size, good monodispersity and good controllability, and they show great application potential in many fields such as thin film preparation, inkjet printing, biopharmaceuticals, etc.

[0003] In recent years, the research and application of electrostatic atomization mainly focuses on the cone-jet mode, because in this mode a small group of fine atomized droplets with good monodispersity can be stably generated. However, when electrostatic atomization operates in this mode, there is a highly positive power relationship between the generated droplet size and the liquid supply flow. This means that if you want to obtain a group of micro / nano-sized atomized droplets in this mode, you must limit the supply flow to a very small amount. This characteristic greatly limits the production of atomized droplets when electrostatic spraying is applied in the industrial field. The research on multi-jet mode and its integration provides a new solution to break through the flow bottleneck of electrostatic atomization. In the multi-jet mode, the supply flow can be greatly improved, while the size of the generated droplets can still be maintained at the micro / nano level. On this basis, if the nozzle is arrayed and integrated, that is, the number of superimposed nozzles is arranged in a certain way, and operates in the multi-jet mode, the production of atomized droplets can be further greatly improved.

[0004] At present, the main defect of electrospray operating in the multi-jet mode is that the stability is not strong. When arrayed and integrated nozzles are used and operate in the multi-jet mode, the jet between adjacent nozzles will also produce voltage edge effect due to the existence of spraying current, and interfere with each other. In general, the instability of the multi-jet mode affects the monodispersity and other characteristics of the generated droplets, which is the main technical bottleneck that limits its application in industrial production. SUMMARY

[0005] In order to solve the problems in the prior art, the application provides a superimposed disc type charged stable multi-jet flow atomization device, which adopts a superimposed disc with a novel electric field enhancement structure and an adjusting cylinder with a space shielding effect, greatly improves the jet stability and atomization flow of the electrostatic atomization device, solves the problem of stable atomization flow of the traditional electrostatic atomization device, and thus the integrated device has the advantages of large supply flow, small device size, low cost, high stability and the like, and can effectively improve the efficiency of the current vertical integrated atomization device in the multi-jet flow mode and the monodispersity and yield of the generated atomized droplets.

[0006] The technical scheme adopted by the application is as follows:

[0007] A superimposed disc type charged stable multi-jet flow atomization device comprises:

[0008] A liquid injection unit comprises a liquid delivery pipe.

[0009] A multi-jet flow atomization unit comprises a disc, the disc is arranged in multiple layers along the axis of the liquid delivery pipe, and a liquid outlet hole is arranged at the connection position of the liquid delivery pipe and the disc; and the disc is connected to a negative high-voltage power supply.

[0010] An air-assisted conveying unit comprises an adjusting cylinder and a ground electrode cylinder, the adjusting cylinder and the ground electrode cylinder are sequentially sleeved outside the liquid delivery pipe from inside to outside, and a gap is arranged at the position opposite to the disc of the adjusting cylinder; the adjusting cylinder is connected to the negative high-voltage power supply, and the ground electrode cylinder is grounded.

[0011] Further, the disc is conical and gradually expands from top to bottom, and the edge of the bottom of the disc is a horizontal ring surface.

[0012] Further, a plurality of V-shaped grooves are arranged on the upper surface of the disc in an array along the axis.

[0013] Further, a plurality of liquid outlet holes are arranged on the liquid delivery pipe in multiple layers along the axis, the hole diameter of the liquid outlet holes gradually decreases from top to bottom, and the liquid outlet holes are located above the disc.

[0014] Further, an annular flow channel is arranged between the adjusting cylinder and the ground electrode cylinder, and a fan is arranged at the upper portion of the annular flow channel.

[0015] Further, a guide vane is arranged in the annular flow channel.

[0016] Further, a hydrophobic coating is arranged on the outer surface of the adjusting cylinder.

[0017] Further, the adjusting cylinder and the ground electrode cylinder are made of PVC plastic, and the lower inner wall is covered with a copper foil patch.

[0018] Further, the infusion tube is made of conductive metal, and the adjusting cylinder and the infusion tube are connected by nylon insulation.

[0019] Further, the infusion tube is connected to the peristaltic pump through a pipeline to pump the atomized working medium into the infusion tube.

[0020] The beneficial effects of the present application are:

[0021] 1. For the disc used in the device, by reasonable shape design and working condition setting, the large flow electrostatic spraying function can be realized by using multiple disc stacking. Compared with the conventional conical jet mode, the multi-jet mode atomized jet produced by the device not only ensures a large supply flow, but also expands the stable operation interval of the multi-jet mode, and maintains the good properties of the generated atomized droplets, which is of great significance to the practicability of multi-jet electrostatic atomization.

[0022] 2. The voltage edge effect between the grooves of the vertically stacked discs is solved, the device is simple to assemble and low in cost, the voltage edge effect between adjacent grooves is eliminated, the jets generated by the tips of each groove do not interfere with each other. In addition, the electrode shielding device also realizes the limitation of the jet angle of the multi-jet, which can gather the generated mist droplets in a smaller space.

[0023] 3. By further improving the integration of the vertically stacked integrated atomization device, the supply flow can be doubled, and the atomized droplet yield can be greatly improved. At the same time, the average diameter and size distribution of the generated atomized droplets can maintain similar good properties to the droplets generated in the conical jet mode, and will not change significantly with the increase of integration. In this way, large flow droplet production in multi-jet mode is realized, the stable operation interval is expanded, and the advantages of stable conical jet mode atomization process, convenient operation, and good properties of generated droplets are also possessed, which is difficult to achieve by traditional atomization methods and ordinary nozzle devices. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a cross-sectional view of a charged stable multi-jet atomization device of the present application;

[0025] Figure 2 is a front view of the jet outlet of the stacked disc in the present application;

[0026] Figure 3 is a top view of a single disc, and the internal solid line is a V-shaped groove;

[0027] In the figure, 1. peristaltic pump, 2. infusion tube, 3. liquid outlet hole, 4. disc, 5. ground electrode cylinder, 6. adjusting cylinder, 7. gap, 8. copper foil patch, 9. V-shaped groove, 10. hydrophobic coating, 11. nylon material, 12. fan, 13. guide vane, 14. annular flow channel. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0029] The present application designs a superimposed disc type charged stable multi-jet flow atomization device, which is combined with the drawings Figure 1 As shown in the drawings, the device mainly includes a liquid injection unit, a multi-jet flow atomization unit and a gas-assisted transport unit. More specifically, the liquid injection unit includes an infusion tube 2, which is made of a conductive metal, and the infusion tube 2 is connected to a peristaltic pump 1 through a pipeline to input the working medium to be atomized into the infusion tube 2. A plurality of layers of liquid outlet holes 3 are arranged on the infusion tube 2 in the axial direction. In this embodiment, three layers of liquid outlet holes 3 are arranged, and each layer is arranged with four liquid outlet holes 3 at equal intervals in the circumferential direction. The hole diameters from top to bottom are 0.5 mm, 0.4 mm and 0.3 mm, respectively.

[0030] The multi-jet flow atomization unit includes a plurality of discs 4, which are arranged in multiple layers in the axial direction of the infusion tube 2, and the discs 4 in each layer have the same structure. As shown in the drawings Figure 3 The disc 4 in this embodiment is a conical surface structure, and the cone angle is about 170°. The end of the disc is folded to form a horizontal annular surface, and the width of the annular surface is about 2 mm. The diameter of the disc is 20 mm. The upper surface of the disc 4 is provided with 24 V-shaped grooves 9 which are symmetrical in the axial direction. The V-shaped grooves 9 at the ends of adjacent discs are staggered by 7.5°. Each layer of discs 4 corresponds to the layer of liquid outlet holes 3 below, so that the atomized working medium flows out of the liquid outlet holes 3 to the corresponding discs 4, and then flows to the end of the horizontal end of the disc 4 through the V-shaped grooves 9.

[0031] The gas-assisted transport unit includes an adjusting cylinder 6 and a ground electrode cylinder 5, which are sequentially sleeved outside the infusion tube 2 from the inside. The adjusting cylinder 6 is provided with a gap 7 corresponding to the V-shaped groove 9 on the disc 4, and the adjusting cylinder 6 and the ground electrode cylinder 5 form an annular flow channel 14. A micro fan is arranged at the center of the top end of the ground electrode cylinder 5, i.e. a fan 12 is arranged at the upper part of the annular flow channel 14, and a guide vane 13 is arranged in the annular flow channel 14. The superimposed disc 4 and the adjusting cylinder 6 are respectively connected to a negative high-voltage power supply, the superimposed disc is connected to a negative high-voltage power supply 1 (such as -2kV), and the adjusting cylinder is connected to a negative high-voltage power supply 2 (such as -10kV), thereby forming a first potential difference. The ground electrode cylinder 5 is grounded and a second potential difference exists between the adjusting cylinder 6.

[0032] In the embodiment, the outer surface of the adjusting cylinder 6 is coated with a hydrophobic coating. The adjusting cylinder 6 and the ground electrode cylinder 5 are made of PVC plastic, and the lower inner wall is covered with a copper foil patch.

[0033] In the embodiment, the infusion tube 2 is made of conductive metal, and the adjusting cylinder 6 and the infusion tube 2 are connected by nylon material 11.

[0034] The working process of the present application is further explained as follows:

[0035] Under the conditions of ambient temperature 25℃±0.5℃ and relative humidity 40%±2.5%, the atomized working substance is filled into the solution cavity, and the atomized working substance is supplied to the infusion tube at the connection of the nylon material 11 by a micro peristaltic pump through a hose, and the total flow rate is controlled to be 200-600ml / h, and then flows downward in the infusion tube. The infusion tube is connected with three layers of discs respectively, and the discs are connected with the infusion tube at the openings, and the sizes of the openings from top to bottom are 0.5mm, 0.4mm and 0.3mm respectively, and the liquid outlet holes of each layer are axially symmetrical and opened in four holes, and the liquid flows out from the liquid outlet holes to the discs, and the stacked discs are conical surface structures with a cone angle of about 170°, and the end of the disc is folded to be a horizontal ring surface with a width of about 2mm, and the diameter of the disc is 20mm. There are 24 V-shaped grooves on the upper surface of the stacked disc, which are axially symmetrical, and the V-shaped grooves at the ends of adjacent discs are staggered by 7.5°. The atomized working substance flows to the end of the horizontal end of the disc through the V-shaped grooves, and then is sprayed out of the annular gap and broken in the annular flow channel under the action of the high-voltage electrostatic field, so as to realize the atomization effect of the working substance. With the increase of the applied voltage, the atomized jet gradually changes into a stable multi-jet mode, and at this time, the monodispersity of the atomized droplets is best. At this time, the downward wind direction formed by the upper micro fan can transport the charged droplets formed by the electrostatic spraying at the end of the disc to the downstream through the guide vane. It should be noted that, with the space shielding effect of the stacked disc with the new type of electric field enhancement structure and the adjusting cylinder, the atomization flow rate and the jet stability of the electrostatic atomization device can be greatly improved.

[0036] The above embodiments are only used to illustrate the design idea and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and the protection scope of the present application is not limited to the above embodiments. Therefore, any equivalent changes or modifications made according to the principles and design ideas disclosed by the present application are within the protection scope of the present application.

Claims

1. A superimposed disc type charge-stabilized multi-stream jet atomization device, characterized by, The utility model relates to a kind of multi-layered electrostatic atomization device, including: Liquid injection unit, the liquid injection unit includes infusion tube (2); Multi-jet atomization unit, the multi-jet atomization unit includes disc (4), the disc (4) is arranged multiple layers along infusion tube (2) axis direction, and the infusion tube (2) is provided with liquid outlet (3) at disc (4) connection place;The disc (4) is connected with negative high voltage power supply; Gas-assisted transport unit, the gas-assisted transport unit includes adjusting cylinder (6), ground electrode cylinder (5), adjusting cylinder (6), ground electrode cylinder (5) are sequentially sleeved in infusion tube (2) outside from inside to outside, and the adjusting cylinder (6) is provided with gap at opposite place of disc (4);The adjusting cylinder (6) is connected with negative high voltage power supply, and the ground electrode cylinder (5) is grounded;Disc and adjusting cylinder form first-stage potential difference, and ground electrode cylinder is grounded and forms second-stage potential difference with adjusting cylinder;Constitute electric field enhancement structure; The upper surface of the disc (4) is provided with several V-shaped grooves (9) in axial array; The adjusting cylinder (6), ground electrode cylinder (5) are annular flow channel (14) between, and the upper portion of the annular flow channel (14) is provided with fan (12), and the annular flow channel (14) is provided with guide vane (13) in.

2. A superimposed disc type charge-stabilized multi-streaming jet atomization device according to claim 1, wherein, The disc (4) is conical, and it is gradually expanded from top to bottom, and the edge of the bottom of disc (4) is horizontal annular surface.

3. The superimposed disc type charge-stabilized multi-streaming atomizer of claim 1 or 2, wherein, The infusion tube (2) is provided with multiple layers of liquid outlet (3) in axial direction, and the aperture of liquid outlet (3) gradually decreases from top to bottom, and the liquid outlet (3) is located above the disc (4).

4. The superimposed disc type charge-stabilized multi-streaming jet atomization device according to claim 1, wherein, The adjusting cylinder (6) is provided with hydrophobic coating outside.

5. The superimposed disc type charge-stabilized multi-streaming jet atomization device according to claim 1, wherein, The adjusting cylinder (6) and ground electrode cylinder (5) are made of PVC plastic, and the lower inner wall of adjusting cylinder (6) and ground electrode cylinder (5) is covered with copper foil patch.

6. A superimposed disc type charge-stabilized multi-streaming jet atomization device according to claim 1, wherein, The infusion tube (2) is made of conductive metal, and the adjusting cylinder (6) and infusion tube (2) are connected by nylon material (11) insulation.

7. A superposed disc type charge-stabilized multi-streamer atomizing device according to claim 6, characterized in that, The infusion tube (2) is connected with peristaltic pump (1) by pipeline, and the atomized working substance is pumped into the infusion tube (2).

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